yaml 3 列布局

 1 2 3
 1 3 2 
 2 1 3 
 2 3 1 
 3 1 2 
 3 2 1

/* 1 3 2 的布局如下 */
 
.col1 {
	float: left;
	width: 100px;
	background: blue;
}
.col1-content {
	
}

.col2 {
	float: right;
	width: 100px;
	background: yellow;
}
.col2-content {
	
}

.col3 {
	margin: 0 100px 0 100px;
	background: green;
}
.col3-content {
	
}

<div class="col1">a左
	<div class="col1-content">aa</div>
</div>
<div class="col2">b右
	<div class="col2-content">bb</div>
</div>
<div class="col3">c中
	<div class="col3-content">cc</div>
</div>
